The best replacement for fret is fretless bass.

The best alternatives to fret are rated as following:
★★★★★  fretless bass
★★★  fretless
★★★  worry
★★  14 fret
★  24 fret
★  medium fret
★  22 fret
★  finger ease
★  no fret
★  lemon oil
★  bifc
  22
  12 fret
  flat fret
  bret
  jumbo fret
  harmonic
  nickel fret
  frap
  bar fret

Your alternative for fret is not listed? Suggest!
Speaking about fret, one probably shouldn't forget about gfp.

Other search terms related to fret and their ratings are:
★★★★★ gfp
★ chords
You have in mind a companion for fret and it is not yet here? Propose!



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fret
fretless bass
fretless